It's a 'Buffy the Vampire Slayer' reunion on 'Ringer'! Amber Benson will cast her spell on The CW drama in the show's 10th episode.

According to TV Guide, Benson -- known to Whedonites as the dearly departed witch Tara -- will play Mary Curtis, a stripper who is also an informant for Nestor Carbonell's character Agent Machado.

Our fingers are crossed for some flashbacks of Sarah Michelle Gellar's Bridget hanging out with Benson's Mary!

'Ringer' will now air twice a week, once on Tuesdays at 9PM and again Wednesdays at 8PM on The CW, replacing 'H8R.'

In other casting news ...

Another 'Buffy' veteran has booked a primetime gig. Emma Caulfield will guest star on ABC's 'Once Upon a Time.' [Emma Caulfield via Twitter]

'Alphas' actor Malik Yoba will guest star on 'Nikita.' Yoba will play Wallace, an Immigration and Customs Enforcement agent who messes with Alex's vengeance quest. [TVLine]

Bravo is looking for rich techies for a new reality series. The network is looking to cast folks for a new Silicon Valley reality series. "Whether you're in law, business, technology, film, advertising, medical, culinary ... any career goes. As long as you're living life in the fast lane, we want to hear from you!" the casting ad reads. [THR]

Keir O'Donnell, David Denman, Shannon Lucio and Eric Lange have joined the cast of TNT's 'Gateway.' The four join Keith Carradine and Cam Gigandet in the Western pilot. [Deadline]